Back to results
US 2013/0047982 A1Published application
End of service life indicator for respirator
AssigneeHoneywell International Inc.
InventorsPeter Tobias, Christopher Scott Larsen
Life of this patent
Estimating the term…
Abstract
A device includes a cartridge containing a filter material. An insert extends through at least a portion of the filter material. The insert has gas sample path with an opening to provide a sample of air that is representative of the saturation of the filter material. A return path may be included in the insert to return sampled gas to the filter material. A gas mask contains a gas sensor and coupled to the cartridge, which may be replaced when saturated.
Claims21
A device comprising:
- a cartridge containing a filter material;
- and
- an insert extending through at least a portion of the filter material and having a first path with an opening to provide a sample of air that is representative of the saturation of the filter material.
A respirator comprising:
- an air path to provide air to a user;
- a gas sample path;
- a gas sensor coupled to the gas sample path to receive and sense a gas sample;
- a gas return path coupled to the gas sensor to receive the sensed gas sample;
- and
- a coupler to couple the air path, gas sample path, and gas return path to a filter cartridge.
3 more elements
A method comprising:
- obtaining a sample of air that has traversed a substantial portion of filter material in a respirator filter cartridge to provide to a gas sensor;
- returning the sample of air to the filter material downstream of the point in the filter material where the sample was obtained;
- and
- filtering the return sample of air to provide the sample to a user to breathe.
1 more element
Dependencies are inferred from the claim text.